20312494 has 4 divisors (see below), whose sum is σ = 30468744. Its totient is φ = 10156246.

The previous prime is 20312491. The next prime is 20312497. The reversal of 20312494 is 49421302.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (20312491) and next prime (20312497).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20312491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5078122 + ... + 5078125.

It is an arithmetic number, because the mean of its divisors is an integer number (7617186).

Almost surely, 2^20312494 is an apocalyptic number.

20312494 is a deficient number, since it is larger than the sum of its proper divisors (10156250).

20312494 is a wasteful number, since it uses less digits than its factorization.

20312494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10156249.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 20312494 is about 4506.9384286897. The cubic root of 20312494 is about 272.8481939002.

Adding to 20312494 its reverse (49421302), we get a palindrome (69733796).

It can be divided in two parts, 20 and 312494, that multiplied together give a triangular number (6249880 = T₃₅₃₅).

The spelling of 20312494 in words is "twenty million, three hundred twelve thousand, four hundred ninety-four".